Method and device for process heat generation
US4867674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Mar 3, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23C6/04
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
In the method, a process medium (14) is heated in two stages, in which fuel oil and gas premixed with air in a burner device (1) are partially burnt in a preliminary combustion chamber (12) substoichiometrically with an air coefficient (.lambda.) of approximately 0.7. The partially burnt mixture, which is low in nitrogen oxides, reaches a temperature of 1800.degree.-1900.degree. C., heats the process medium (14), which is already preheated to an intermediate temperature, to its final temperature in a heat exchanger (13) with counter-current flow and is cooled to 700.degree.-900.degree. C. In an air injection region (15) of the process heat generator the partially burnt mixture is mixed with quenching air in a stoichiometric ratio with respect to the unburnt fractions and is thereby completely burnt in a secondary combustion chamber (18) during which practically no nitrogen oxides (NO.sub.x) are produced. It reaches a temperature of 900.degree.-1300.degree. C. and then heats the process medium (14) from its initial temperature to the aforesaid intermediate temperature in a second heat exchanger (19 ). The process medium flows between the two heat exchangers (13, 19) and the process …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.